Question

multiple - choice question
2k + mgo ---> mg + k2o
in this reaction, magnesium (mg) has been replaced by ______.
o, oxygen
k, potassium

Explanation:

This is a single - displacement reaction. In a single - displacement reaction, one element replaces another element in a compound. In the reaction \(2K+MgO
ightarrow Mg + K_{2}O\), potassium (\(K\)) is replacing magnesium (\(Mg\)) in magnesium oxide (\(MgO\)). Oxygen (\(O\)) is not replacing \(Mg\) as it is part of the oxide compound and remains in the oxide form (\(K_{2}O\)) after the reaction.

Answer:

K, potassium